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Past X-ray observations of the nearby luminous quasar PDS 456 (at $z=0.184$)have revealed a wide angle accretion disk wind (Nardini et al. 2015), with anoutflow velocity of $\sim-0.25c$. Here we unveil a new, relativistic componentof the wind through hard X-ray observations with NuSTAR and XMM-Newton,obtained in March 2017 when the quasar was in a low flux state. This very fastwind component, with an outflow velocity of $-0.46\pm0.02c$, is detected in theiron K band, in addition to the $-0.25c$ wind zone. The relativistic componentmay arise from the innermost disk wind, launched from close to the black holeat radius of $\sim10$ gravitational radii. The opacity of the fast wind alsoincreases during a possible obscuration event lasting for 50 ks. We suggestthat the very fast wind may only be apparent during the lowest X-ray fluxstates of PDS 456, becoming overly ionized as the luminosity increases.Overall, the total wind power may even approach the Eddington value.

A new relativistic component of the accretion disk wind in PDS 456